Technical Brief

Probabilistic Failure of Graphite Epoxy Composite Plates Due to Low Velocity Impact

[+] Author and Article Information
Shivdayal Patel

Assistant Professor
Department of Mechanical Engineering,
National Institute of Technology Delhi,
New Delhi 110040, India
e-mail: shiv_dayal_patel@live.com

Suhail Ahmad

Department of Applied Mechanics,
Indian Institute of Technology Delhi,
New Delhi 110016, India

1Corresponding author.

Contributed by the Design Automation Committee of ASME for publication in the JOURNAL OF MECHANICAL DESIGN. Manuscript received August 3, 2016; final manuscript received December 20, 2016; published online January 27, 2017. Assoc. Editor: Zissimos P. Mourelatos.

J. Mech. Des 139(4), 044501 (Jan 27, 2017) (4 pages) Paper No: MD-16-1552; doi: 10.1115/1.4035678 History: Received August 03, 2016; Revised December 20, 2016

Stochastic finite-element analysis of composite plates due to low velocity impact (LVI) is studied, considering the material properties (Young's modulii, Poisson's ratio, strengths, and fracture energy) and initial velocity as random parameters. Damage initiation and propagation failure due to matrix cracking are investigated for safety criteria for the LVI. Progressive damage mechanics is employed to predict the stochastic dynamic response of the plates. The Gaussian process response surface method (GPRSM) is presently adopted to determine the probability of failure (Pf). There is a possibility of underestimation of the peak contact force and displacement by 10.7% and 11.03%, respectively, if the scatter in the properties is not considered. The sensitivity-based probabilistic design optimization procedure is investigated to achieve better strength and lighter weight of composite for body armors.

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Grahic Jump Location
Fig. 2

Probabilistic response of displacement time history

Grahic Jump Location
Fig. 1

Probabilistic response of contact force time history

Grahic Jump Location
Fig. 3

Sensitivity of Pf for matrix cracking propagation at impactor velocity of 35 m/s

Grahic Jump Location
Fig. 4

CDF for matrix cracking propagation at impactor velocity of 35 m/s



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